physics
posted by Alex .
I have been stuck on this for a while now and cant figure out what it is i am doing wrong HELP!!!
A tennis ball with a velocity of 15.5 m/s is
thrown perpendicularly at a wall. After strik
ing the wall, the ball rebounds in the opposite
direction with a speed of 9.3 m/s.
If the ball is in contact with the wall for
0.015 s, what is the average acceleration of
the ball while it is in contact with the wall?

aq = (VVo)/t = (9.315.5) 0.015=1660
m/s^2.
NOTE: The final velocity is in the opposite direction. Therefore, it is
NEGATIVE.
A 2nd interpretation:
While the ball is in contact with the wall, its' velocity is o.
a = (015.5) / 0.015 = 1033.3 m/s^2.
Respond to this Question
Similar Questions

Physics
A rubber ball is thrown against the wall. The ball has a mass of 4 g and strikes the wall perpendicularly with a speed of 12 m/s. The acceleration is constant while the ball is touching the wall. After touching the wall, the center … 
Physics URGENT
A tennis ball with a velocity of +10.7m/s to the right is thrown perpendicularly at a wall. After striking the wall, the ball rebounds in the opposite direction with a velocity of 5.9 m/s (to the left). If the ball is in contact with … 
Physics
A tennis ball with a speed of 5.0 m/s is thrown perpendicularly at a wall. After striking the wall, the ball rebounds in the opposite direction with a speed of 3.0 m/s. If the ball is in contact with the wall for 0.013 s, what is the … 
physics
A tennis ball with a speed of 6.0 m/s is thrown perpendicularly at a wall. After striking the wall, the ball rebounds in the opposite direction with a speed of 4.0 m/s. If the ball is in contact with the wall for 0.012 s, what is the … 
Physics
A tennis ball with a velocity of 24.4 m/s is thrown perpendicularly at a wall. After striking the wall, the ball rebounds in the opposite direction with a speed of 16 m/s. If the ball is in contact with the wall for 0.013 s, what is … 
physics
A tennis ball with a velocity of +9.6 m/s to the right is thrown perpendicularly at a wall. After striking the wall, the ball rebounds in the opposite direction with a velocity of 5.8 m/s (to the left). If the ball is in contact with … 
Physics
A 50g tennis ball is thrown with a velocity of 12 m/s. It strikes a wall and rebounds with a velocity of 10 m/s. a) What is the ball's initial and final momentum? 
physics
 A tennis ball with a speed of 11.4 m/s is thrown perpendicularly at a wall. After striking the wall, the ball rebounds in the opposite direction with … 
Physics
Randy throws a tennis ball horizonally to hit a wall 20 m away. If the ball hits the wall 1.5s after it is thrown, what is the horizontal component of the balls velocity? 
physics
A tennis ball with a velocity of 30.0 m/s to the right is thrown perpendicularly at a wall. After striking the wall, the ball rebounds in the opposite direction with a velocity of 8 m/s to the left. If the ball is in contact with …